"Messy Duo" 1 Stroke Cannon Engine

"Messy Duo" stands for messy duo action engine (in other words, engine with 2 opossing pistons firing at same time and because pistons use cannons "emissions" is a mess). It has an extra heavy flywheel, 2 opossing pistons, hidden starter and a crankshaft with guard (guard is used to no cannon balls get stuck in crankshaft itself). As for an engine it's really unpractical: low torque, low rpm, poor torque curve but on another hand it looks cool when zoomed out with zero-g on^^. Invincibility and infinite ammo is needed, zero-g creates a nice effect+lower FPS drops from cannon balls. Hold Y for few secs to start.